Lubricated plug valve



July 21, 1936. JACOBSEN 2,048,385

LUBRICATED PLUG VALVE Filed Dec. 27, 1955 w as re as as a 4 a? Mg m ATTEe Patented July 21, i936 v 2,048,385 nunoa'rnn rape vva Otein .iacobsen,Dayton, Ohio,

to The 1 w Company, line... a coration of New esteem December 27, 1935,Serial No. 56,329

The invention relates to lubricated cocks or valves, and has for itsprincipal objects the pro- Y vision of a valve of the type specifiedhaving improved means for lubricating the plug and lifting it withrespect to its seat, in case it becomes stuck. A further object is theprovision of a valve of very cheap. simple construction, which has bothmechanical and hydraulic means for freeing the valve, which may be usedtogether or independently, depending upon conditions encountered.Certain embodiments of the invention are illustrated-in the accompanyingdrawing, wherein:

Figure 1 is a vertical section through the preferred construction. Fig.2 is a partial bottom view. And Figs. 3 and 4 are partial verticalsections through modifications. i

Referring to Figs. 1 and 2, 5 is the valve casing, 6 is the plug orcock, and I is the follower of a stumng box. The plug is tapered, asshown,

and has the lubricating grooves I. Suitable packing S is employed aroundthe stem or shank ll of the plug, such packing lying above the wear ringII. The follower is adjusted downward to compress the packing by theusual bolts which are not shown. The upper end of the plug shank isformed so asto permit the application of a handle or wrench.

Located beneath the plug is a lubricant chamber li-with which thegrooves 8 communicate at their lower ends. An opening is provided in thebottom wall of the chamber, and into this opening is threaded the upperend l3 ofthe closure member ll, a gasket It being provided to' insure aseal. The member ll isprovided with a lubricant cavity I, and-throughthe side of the cavity is threaded a screw H. The plug is lubricated byturning the screw at suitable intervals to move it inward, which actionapplies pres- 4 sure to the lubricant in the cavity l6 and the chamber12 forcing it upward through the grooves I. If the plug becomes stuck,it may be loosened by turning the screw until the plug is lifted fromits seat.

4 The valve may-also be loosened in case of sticking by the plunger IIwhich extends through the member I4 and chamber I! with its upper end orhead in proximity with the lower end of the plug. To accomplish thisresult, the lower end of the plunger is tapped with a hammer until thevalve is freed from its seat. The member it is provided with a stufiingbox l9 provided with packing 20 which is compressed by the fol- 5 lower,it. The plunger acts more quickly and positively than the hydraulic pluglifting means, and may be used to advantage where a quick freeing of theplug is necessary or in cases in which the lubricant has becomeexhausted. 10

Fig. 3 illustrates a modification, in'which only the mechanical plugfreeing-means is employed,

such means comprising the plunger 23 mounted in the closure member 24 asin the construction of Figs. 1 and 2. The lubricant chamber 25 may 15 besupplied with lubricant from above from suitable supply means throughthe grooves in the plug 26.

Fig. 4 shows a further modification, in which the mechanical plugfreeing means is omitted, the 90 construction in other respectsfollowing that of Figs. 1 and 2. The closure member 21 has a cavity 28for lubricant and carries the screw 29 for feeding the lubricant upthrough the opening 30 to the lubricant chamber 3| beneath the g5 plug32. c

What I claim is:

In combination in a plug cock, a casing open at its upper end having atapering seat and a chamber or recess for lubricant below the seat 30with an opening through its bottom wall, a tapering plug, a hollowclosure member for said chamber secured to the casing in sealingrelation with said opening and having an opening axially of the plug, ascrew threaded through said member 35 transversely of the center line ofthe plug at one .side thereof and adapted to apply pressure to thelubricant in the member when it is screwed inward, and a plunger mountedfor sliding movement through the member axially of the plug 40 andadapted, when struck at its lower end, to

move up and strike the lower end of the plug. the plunger and theopening in the member being formed so as to permit a flow of lubricantalong the plunger from the member to said 46 chamber.

" O. JACOB SEN.

